Exhibit 99.1

CVB Financial Corp. Announces New Stock Repurchase Plan

Ontario, CA, November 5, 2020—ONTARIO, Calif.—(BUSINESS WIRE)— CVB Financial Corp. (the “Company”) announced today that, pursuant to the Company’s common stock repurchase program (the “Repurchase Program”), the Company has entered into a new Rule 10b5-1 repurchase plan (the “2020 10b5-1 Plan”) on November 5, 2020. Pursuant to the 2020 10b5-1 Plan, a maximum of 4,585,145 shares of the Company’s common stock may be repurchased by the Company, beginning on November 6, 2020 until the 2020 10b5-1 Plan expires on November 5, 2021, unless completed sooner or the 2020 10b5-1 Plan is otherwise extended or terminated. On August 11, 2016, the Company’s Board authorized an increase to the Company’s Repurchase Program, originally announced on July 16, 2008, to a maximum of 10,000,000 shares of the Company’s common stock. The Company has repurchased 5,414,855 shares of its common stock since the date of the announced increase to the Repurchase Program. Accordingly, as of November 5, 2020, 4,585,145 million of the Company’s shares of common stock remain available for repurchase under the Repurchase Program.

Corporate Overview

CVB Financial Corp. (“CVBF”) is the holding company for Citizens Business Bank. CVBF is one of the 10 largest bank holding companies headquartered in California with over $13 billion in total assets. Citizens Business Bank is consistently recognized as one of the top performing banks in the nation and offers a wide array of banking, lending and investing services through 57 banking centers and 3 trust office locations serving the Inland Empire, Los Angeles County, Orange County, San Diego County, Ventura County, Santa Barbara County, and the Central Valley area of California.

Shares of CVB Financial Corp. common stock are listed on the NASDAQ under the ticker symbol “CVBF”. For investor information on CVB Financial Corp., visit our Citizens Business Bank website at www.cbbank.com and click on the “Investors” tab.

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Safe Harbor

Certain matters set forth herein (including the exhibits hereto) constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including forward-looking statements relating to the Company’s current business plans and expectations and our future financial position and operating results. Words such as “will likely result”, “aims”, “anticipates”, “believes”, “could”, “estimates”, “expects”, “hopes”, “intends”, “may”, “plans”, “projects”, “seeks”, “should”, “will,” “strategy”, “possibility”, and variations of these words and similar expressions help to identify these forward-looking statements, which involve risks and uncertainties. These forward-looking statements are subject to risks and uncertainties that could cause actual results, performance and/or achievements to differ materially from those projected. These risks and uncertainties include, but are not limited to, local, regional, national and international economic and market conditions and political events and the impact they may have on us, our customers and our assets and liabilities; our ability to attract deposits and other sources of funding or liquidity; supply and demand for commercial or residential real estate and periodic deterioration in real estate prices and/or values in California or other states where we lend; a sharp or prolonged slowdown or decline in real estate construction, sales or leasing activities; changes in the financial performance and/or condition of our borrowers, depositors, key vendors or counterparties; changes in our levels of delinquent loans, nonperforming assets, allowance for credit losses and charge-offs; the costs or effects of mergers, acquisitions or dispositions we may make, whether we are able to obtain any required governmental approvals in connection with any such mergers, acquisitions or dispositions, and/or our ability to realize the contemplated financial or business benefits associated with any such mergers, acquisitions or dispositions; the effects of new laws, regulations and/or government programs, including those laws, regulations and programs enacted by federal, state or local governments in the geographic jurisdictions in which we do business in response to the recent national emergency declared in connection with the COVID-19 pandemic; the impact of the federal CARES Act and the significant additional lending activities undertaken by the Company in connection with the Small Business Administration’s Paycheck Protection Program enacted thereunder, including risks to the Company with respect to the uncertain application by the Small Business Administration of new borrower and loan eligibility, forgiveness and audit criteria; the effects of the Company’s participation in one or more of the new lending programs recently established by the Federal Reserve, including the Main Street New Loan Facility, the Main Street Priority Loan Facility and the Nonprofit Organization New Loan Facility, and the impact of any related actions or decisions by the Federal Reserve Bank of Boston and its special purpose vehicle established pursuant to such lending programs; the effect of changes in other pertinent laws, regulations and applicable judicial decisions (including laws, regulations and judicial decisions concerning financial reforms, taxes, bank capital levels, allowance for credit losses, consumer, commercial or secured lending, securities and securities trading and hedging, bank operations, compliance, fair lending, the Community Reinvestment Act, employment, executive compensation, insurance, cybersecurity, vendor management and information security technology) with which we and our subsidiaries must comply or believe we should comply or which may otherwise impact us; changes in estimates of future reserve requirements and minimum capital requirements, based upon the periodic review thereof under relevant regulatory and accounting standards, including changes in the Basel Committee framework establishing capital standards for bank credit, operations and market risks; the accuracy of the assumptions and estimates and the absence of technical error in implementation or calibration of models used to estimate the fair value of financial instruments or currently expected credit losses or delinquencies; inflation, changes in market interest rates, securities market and monetary fluctuations; changes in government-established interest rates, reference rates or monetary policies, including the possible imposition of negative interest rates on bank reserves; the impact of the anticipated phase-out of the London Interbank Offered Rate (LIBOR) on interest rate indexes specified in certain of our customer loan agreements and in our interest rate swap arrangements, including any economic and compliance effects related to the expected change from LIBOR to an alternative reference rate; changes in the amount, cost and availability of deposit insurance; disruptions in the infrastructure that supports our business and the communities where we are located, which are concentrated in California, involving or related to physical site access and/or communication facilities; cyber incidents, attacks, infiltrations, exfiltrations, or theft or loss of Company, customer or employee data or money; political developments, uncertainties or instability, catastrophic events, acts of war or terrorism, or natural disasters, such as earthquakes, drought, the effects of pandemic

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diseases, climate change or extreme weather events, that may affect electrical, environmental and communications or other services, computer services or facilities we use, or that affect our assets, customers, employees or third parties with whom we conduct business; our timely development and implementation of new banking products and services and the perceived overall value of these products and services by our customers and potential customers; the Company’s relationships with and reliance upon outside vendors with respect to certain of the Company’s key internal and external systems, applications and controls; changes in commercial or consumer spending, borrowing and savings preferences or behaviors; technological changes and the expanding use of technology in banking and financial services (including the adoption of mobile banking, funds transfer applications, electronic marketplaces for loans, block-chain technology and other banking products, systems or services); our ability to retain and increase market share, to retain and grow customers and to control expenses; changes in the competitive environment among banks and other financial services and technology providers; competition and innovation with respect to financial products and services by banks, financial institutions and non-traditional providers including retail businesses and technology companies; volatility in the credit and equity markets and its effect on the general economy or local or regional business conditions or on the Company’s capital, assets or customers; fluctuations in the price of the Company’s common stock or other securities, and the resulting impact on the Company’s ability to raise capital or to make acquisitions; the effect of changes in accounting policies and practices, as may be adopted from time-to-time by the principal regulatory agencies with jurisdiction over the Company, as well as by the Public Company Accounting Oversight Board, the Financial Accounting Standards Board and other accounting standard-setters; changes in our organization, management, compensation and benefit plans, and our ability to recruit and retain or expand or contract our workforce, management team, key executive positions and/or our board of directors; our ability to identify suitable and qualified replacements for any of our executive officers who may leave their employment with us, including our Chief Executive Officer; the costs and effects of legal, compliance and regulatory actions, changes and developments, including the initiation and resolution of legal proceedings (including any securities, lender liability, bank operations, financial product or service, data privacy, consumer or employee class action litigation); regulatory or other governmental inquiries or investigations, and/or the results of regulatory examinations or reviews; our ongoing relations with our various federal and state regulators, including the SEC, Federal Reserve Board, FDIC and California DFPI; our success at managing the risks involved in the foregoing items and all other factors set forth in the Company’s public reports, including our Annual Report on Form 10-K for the year ended December 31, 2019, and particularly the discussion of risk factors within that document. Among other risks, the ongoing COVID-19 pandemic may significantly affect the banking industry and the Company’s business prospects. The ultimate impact on our business and financial results will depend on future developments, which are highly uncertain and cannot be predicted, including the scope and duration of the pandemic, the impact on the economy, our customers and our business partners, and actions taken by governmental authorities in response to the pandemic. The Company does not undertake, and specifically disclaims any obligation, to update any forward-looking statements to reflect occurrences or unanticipated events or circumstances after the date of such statements, except as required by law. Any statements about future operating results, such as those concerning accretion and dilution to the Company’s earnings or shareholders, are for illustrative purposes only, are not forecasts, and actual results may differ.

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